Maridon Museum, 322 N. McKean St., will host Porcelain Painting Classes with instructor Frances Shiflet from 11 a.m. to 1:30 p.m. Wednesday and June 11 and 18. Fee is $13 per class for non-members, or $10 for members; all materials are provided. Call 724-282-0123 for reservations.

<B>Silver Eye Center for Photography</B>, 1015 E. Carson St., presents "Alternative Focus" in the Main Gallery. This exhibition features pinhole photographs by Jesseca Ferguson of Boston and Tom Persinger of Pittsburgh through June 14. New gallery hours are noon to 6 p.m. Wednesdays and Fridays, noon to 8 p.m. Thursdays, and 11 a.m. to 5 p.m. Saturdays, or by appointment. Admission is free. The New Works Gallery Online features Volume XVI through June 30. Visit the Web site, www.silvereye.org. Call 412-431-1810.<B>Waterworks 2008,</B> the Pittsburgh Watercolor Society annual member show, is on display through Saturday at the 3rd Street Gallery, 220 Third St. in the Carnegie section of Pittsburgh. The show is coordinated by Maria Kovalenko Leysens of Adams Township, who also has the painting "To Remember" in the show. Her watercolor won an honorable mention. Gallery hours are from 11 a.m. to 4 p.m. Wednesdays through Saturdays. Call 412-276-5233 or visit the Web site, www.3rdstreetgallery.net.<B>Carnegie Museum of Art</B>, 4400 Forbes Ave., continues "Life on Mars, the 2008 Carnegie International" through Jan. 11, 2009. The exhibit features 40 emerging and established artists from 17 countries. Regular hours are 10 a.m. to 5 p.m. Tuesdays through Sundays; closed Mondays and major holidays. Admission, which includes the Carnegie Museum of Natural History, is $15 for adults, $12 for senior citizens, and $11 for students and children age 3 and older. Call 412-622-3131 or visit the Web site, www.cmoa.org.<B>North Hills Art Center</B>, 3432 Babcock Blvd. in Ross Township, is hosting Regional 2008, a multi-media, juried exhibit, through June 8. Admission and parking are free. Regular gallery hours are 11 a.m. to 4 p.m. Mondays through Saturdays; closed Sundays. Call 412-364-3622.<B>Frick Art and Historical Center</B>, 7227 Reynolds St. in the Point Breeze section of Pittsburgh, continues "Craig McPherson: Pittsburgh Drawings" through June 8. The Frick Art Museum is open 10 a.m. to 5 p.m. Tuesdays through Sundays; closed Mondays and holidays. Admission is free; docent-led tours are $5 each. Call 412-371-0600.<B>Pittsburgh Glass Center</B>, 5472 Penn Ave., is presenting "Glass & Steel: Art Transcends Industry" through Sept. 5. Gallery hours are 10 a.m. to 4 p.m. Fridays, Saturdays and Sundays; and 10 a.m. to 7 p.m. Tuesdays, Wednesdays and Thursdays. Call 412-365-2145.<B>Andy Warhol Museum</B>, 117 Sandusky St., presents "Piet (Mondrian) in Pittsburgh" through Aug. 31, featuring 24 abstract paintings by the Dutch artist best known for his representations of rigid forms consisting of rectangular shapes of red, yellow, blue, or black, separated by thick, black, rectilinear lines. The large-scale, mixed media sculpture "Transformer: The Work of Glenn Kaino" also runs through Aug.31. "Contemporary Prints from The Bank of New York Mellon Collection" and "Ceramic Explosion: The Work of Martin Klimas," both continue through June 1. Hours are 10 a.m. to 5 p.m. Tuesdays, Wednesdays and Thursdays,10 a.m. to 10 p.m. Fridays, and 10 a.m. to 5 p.m. Saturdays and Sundays; closed Mondays. Admission is $15 for adults, $9 for senior citizens, $8 for children and students. Admission is half-price from 5 to 10 p.m. Fridays. Call 412-237-8300 or visit the Web site, www.warhol.org.<B>Rivers of Steel National Heritage Area</B> is exhibiting "Monongahela Valley: A Time of Change, 1980-2000" featuring paintings, prints, photos and posters by Robert Qualters through June 14 in the Bost Building, 623 E. Eighth Ave. in Homestead. Hours are 10 a.m. to 4 p.m. Mondays through Fridays and by appointment Saturdays. Call 412-464-4020.